Leandro N. Alem is a department of the province of Misiones, Argentina. It borders the departments of Capital, Oberá, Candelaria, Apóstoles, Concepción, and San Javier.
The department covers an area of 1,070 kmò, equivalent to 3.6% of the total province area. Its population is 45,075 (2010 census, INDEC).